Mechanical Engineering Answers

Draw the shear and moment diagrams for the overhang beam.

A vertical diesel engine running at 420 rev/min develops 650 kW and has 4 impulses per revolution. If the fluctuation of ener is 28 % of the work done during each impulse, estimate the cross-sectional are 1. f the rim of the flywheel required to keep the speed within 2.5 rev/min of the mean speed when the mean peripheral speed of the rim is 1440 m/min. Cast iron has a density of 7.2 Mg/m3.

A cooper rod of 3mm diameter when subjected to a pull of 495N extends by 0.07mm over a gauge length of 100mm. Calculate Young's modulus for copper

A vertical diesel engine running at 420 rpm develops 650kw and has 4 impulses per revolution. If the fluctuation of energy is 28% of the work done during each impulse, estimate the cross sectional area of the rim

(iv) In case if the load torque changes it is important to maintain the speed constant in some applications. propose a suitable design to maintain the speed constant. Your design should have the following components:

a) General block diagram for the overall system design.

b) Role of each block

c) Control system

A spherical buoy of diameter 0.5 m and mass 35 kg is attached to the seabed by a mooring rope and floats fully submerged as shown above. Calculate the tension in the mooring rope. The density of sea water is 1020 kgm−3.

a) Explain what is meant by Archimedes’ Principle, make reference to the above diagram in your response. Include a description of the necessary conditions for a body to be immersed in a liquid and be in equilibrium. 

A door is submerged 5m in water. The dimensions of the gate are 5m by 4m wide.

a) the force of the water on the door

b) the distance of the centre of pressure from the surface.

c) If the door is hinged at the bottom of the door, calculate the moment the force produces about this hinge.

Use ρ = 1000 kg/m3

Plan the experiments you will carry out, providing a list of other equipment you would theoretically need for the Laboratory Technician.

After you have written out a plan the experiments present your expected findings as a laboratory report listing equipment, method, results, calculations and conclusion. Your report should also include an evaluation of the two methods.

A 2.0m long conical diffuser 20cm in diameter at the upstream end has 80cm diameter at the downstream end. At the certain instant the discharge through the diffuser is observed to be 200 L/s of water and is found to increase uniformily at the rate of 50 L/s per second. Estimate the local, convective and total acceleration at a seccion 1.5m from the upstream end.